Roadway and pavement.



ments in Roadways and AUGUST EDUARD SCHUTTE, OF NORTHBORO, MASSACHUSETTS.

ROADWAY AND PAVEMENT,

No Drawing To all whom it may concern:

Be it known that I, AUGUST EDUARD SoHUT'rE, of Northboro, in the county of Worcester and State of Massachusetts, have invented certain new and 'useful Improve- Pavements, of which the following is a specification.

My invention relates to roadways known as bituminous roadways and composed of mixtures of sand and stone and bituminous compounds.

In constructing bituminous roadways two methods have been in vogue.-' The first, to F heat the mineral aggregate and mix the same at a plant with'a bituminous compound, haul the mixture while 'it is in a heated condition to the street where it was subsequently laid and rolled, or the other method, to mix the material with a liquid or soft asphalt which did not solidify enough to prevent the mixture being removed from cars and hauled on the street while cold. In this latter process no hard bitumen could be used, and the mixture after being placed on the-street and rolled never had the solidity and firmness consistent with wear, while in the former case, an expensive plant was required to be located near the place of operation so that the material would not coolofi' in the haul,

in which case it became absolutelyuseless.

My invention relates to a method of mixing stone-and sand in appropriate proportions in a hot or warm condition, at a plant located at a quarry, and while such mixture was still warm and in the mixer to add to it an amount of finely powdered talc, soap stone, serpentine, ground asbestos or the like, enough to coat the particles'or groups .of particles with a coating'ofthis material,

so that after it was cool the particles ,or groups of particles composing the mixture would not adhere to each other but could be handled, shipped or carted in a manner similar to ordinary crushed stone. To use this materialin the construction of a roadway it is coated with a solvent pilsuch as crude oil, soft bitumen or the like, which, penetrates-through the coating of talc (or the like), dissolves the'bitumen, cements the whole mass together into a solid waterproof roadway. v

To practise my invention I coat the stone and sand mixture witha suitable bitumen of Specification of Letters Patent.

Application filed March 24, 1913.

and when rolled Patented Mar. 6, 1917. Serial No. 756,413.

any desired hardness and while the mixture is still in the mixer I add to the revolving mass the dust or powder described, which.

coats the particles and prevents their adherence to each other. I'then load the mixture 1nto cars or carts and ship it to the place or town where the pavement is to be laid.

After the same arrives there it is hauled to the street and there mixed in a mixer with the'solvent'oil, then placed, graded and leveled, after which it is consolidated by rolling.

Another method is to lay the mixture asit is hauled to the street, then coat with the oil or bitumen in situi. by a sprayer or. other:

suitable means and then roll and finish, as before described.-

A flushcoating can then be placed upon thissurfaceif desired.

Having described my invention, what I claim as new is 1 1. A method of constructing a roadway by mixing suitable mineral aggregate with bitumen, separating the mixture by means of non-adhesivepowder such as talc, soapstone, serpentine or ground asbestos, into noncohering groups and rendering these groups coherent which permeates the talc and renders the whole capable of being rolled into an adherent durable roadway. p

2. A method of constructing roadway by selecting a mineral aggregate, heating the same, adding a bituminous compound, and mixing until the bitumen has thoroughly permeated with the aggregate, then adding a non-adhesive powder such as talc, soap stone, serpentine, ground asbestos, or the like,' which coats the particles and separates them into non-adher1ng groups, transporting suchmixture vto the placewhere itis to be used, there coating it with a solvent oil which penetrates through the non-adhesive coating, dissolves and softens the bituminous cement and produces an adherent and coherent mixture, which after rollingmakes a water-tight, durable roadway.

In testimony whereof I have afiixed my signature, in presence of two witnesses.

AUGUST EDUARD SCHUTTE,

Witnesses:

CHARLES S. GRAHAM, EARLE W. PIMM.

by the addition of the solvent oil 

